docs: describe the new origin end option to the slider

Author: danieledler

packages/machines/slider/src/slider.types.ts

@@ -114,7 +114,8 @@ interface PublicContext extends DirectionProperty, CommonProperties {
    */
   orientation: "vertical" | "horizontal"
   /**
-   * The origin of the slider range
+   * The origin of the slider range. The track is filled from the origin
+   * to the thumb for single values.
    * - "start": Useful when the value represents an absolute value
    * - "center": Useful when the value represents an offset (relative)
    * - "end": Useful when the value represents an offset from the end

website/data/components/slider.mdx

@@ -150,12 +150,18 @@ const [state, send] = useMachine(
 
 ## Changing the start position
 
-By default, the slider's "zero position" is usually at the start position (left
-in LTR and right in RTL).
+By default, the slider's origin is at the `start` position (left
+in LTR and right in RTL). Change it by setting the `origin` property to these values:
 
-In scenarios where the value represents an offset (or relative value), it might
-be useful to change the "zero position" to center. To do this, pass the `origin`
-context property to `center`.
+- `start`: the track will be filled from start to the thumb (default).
+- `center`: the track will be filled from the center (50%) to the thumb.
+- `end`: the track will be filled from the thumb to the end.
+
+This applies to sliders with single values.
+
+In scenarios where the value represents an offset (or relative value) on a
+diverging scale, it might be useful to change the origin to center. To do this, 
+set the `origin` context property to `center`.
 
 ```jsx {3}
 const [state, send] = useMachine(
@@ -165,6 +171,11 @@ const [state, send] = useMachine(
 )
 ```
 
+In scenarios where the slider value is used as a threshold to include values above it, 
+it might make more sense to set the `origin` to `end` to have the track filled from the 
+thumb to the end.
+
+
 ## Changing the thumb alignment
 
 By default, the thumb is aligned to the start of the track. Set the